Factorial definitions

făk-tôr'ē-əl
Of a factor.
adjective
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Of factors or factorials.
adjective
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The product of a given series of consecutive whole numbers beginning with 1 and ending with the specified number.

The factorial of 5 (5!) is 1 × 2 × 3 × 4 × 5, or 120

noun
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Of or relating to a factor or factorial.
adjective
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The product of all the positive integers from 1 to a given number.

4 factorial, usually written 4!, is equal to 24 (1 × 2 × 3 × 4 = 24).

noun
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The product of all of the positive integers from 1 to a given positive integer. It is written as the given integer followed by an exclamation point. For example, the factorial of 4 (written 4!) is 1 × 2 × 3 × 4, or 24.
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(mathematics) Of or pertaining to a factor or factorial.
adjective
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Of or pertaining to a factor.
adjective
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The number of sequences that can exist with a set of items, derived by multiplying the number of items by the next lowest number until 1 is reached. For example, three items have six sequences (3x2x1=6): 123, 132, 231, 213, 312 and 321. See factor and IFP.
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(mathematics, combinatorics) The result of multiplying a given number of consecutive integers from 1 to the given number. In equations, it is symbolized by an exclamation mark (!). For example, 5! = 1 * 2 * 3 * 4 * 5 = 120.
noun
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(dated) Of or pertaining to a factory.

adjective
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